#42376E
Closest named color: Dark Slate Blue (#483D8B). oklch(37.7% 0.092 290.5), rgb(66, 55, 110).
Aa
White text reads best on this color (10.48:1).
About this color
#42376E is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.092 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.051 away. White text reads best on it, at 10.48:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.092) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.00:1 |
| White text | 10.48:1 |
Values
| HEX | #42376E |
| RGB | rgb(66, 55, 110) |
| HSL | hsl(252, 33%, 32%) |
| OKLCH | oklch(37.7% 0.092 290.5) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #42376E | 10.48:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #42376E | 2.00:1 | Fails | Lc 9.7 | Not readable |
| #42376E text on white | 10.48:1 | AAA | Lc 94.2 | Preferred for body text |
| #42376E text on black | 2.00:1 | Fails | Lc -8.4 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F5F4FB
oklch(97% 0.009 292.8)
-
Step 100
100
#E9E8F7
oklch(93.6% 0.02 289.1)
-
Step 200
200
#D8D5F1
oklch(88.4% 0.038 290.5)
-
Step 300
300
#C0BAEB
oklch(81% 0.069 290.4)
-
Step 400
400
#A094E0
oklch(70.6% 0.11 290.5)
-
Step 500
500
#8A78D7
oklch(63.1% 0.14 290.5)
-
Step 600
600
#755FC5
oklch(55.6% 0.153 290.5)
-
Step 700
700
#624EAA
oklch(49.1% 0.142 290.2)
-
Step 800
800
#50408A
oklch(42.7% 0.118 290.4)
-
Step 900
900 (this color)
#42376E
oklch(37.7% 0.092 290.5)
-
Step 950
950
#272140
oklch(27.1% 0.057 291)
#42376E with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #234070 | 0.048 |
| Deuteranopia (no green cones) | #243E6D | 0.046 |
| Tritanopia (no blue cones) | #37424D | 0.076 |
| Achromatopsia (no color) | #3F3F3F | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42376E
#42376E
oklch(37.7% 0.092 290.5)
- #444500
#444500
oklch(37.7% 0.083 110.7)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #42376E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.051
- Twilight Blue #0A437A ΔE 0.067
- Blueberry #464196 ΔE 0.070
- Dark Grey Blue #29465B ΔE 0.070
- Prussian Blue #1D3557 ΔE 0.071
- Marine Blue #01386A ΔE 0.074
- Cobalt #1E488F ΔE 0.076
- Dark Blue Grey #1F3B4D ΔE 0.082
Use #42376E in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.